Personality

Mamoru is a smug character who uses underhanded tactics and his wealth to get what he wants. Whenever his team loses in a sporting event to Kunio, he tends to react poorly as shown in Bikkuri Nekketsu Shin Kiroku. In fact, he goes out of his way to humiliate Kunio to the point of hiring people to do his dirty work and tell them lies, only for his attempts to end in failure. According to the ending of Crash 'n the Boys: Street Challenge, his obsession to bring Kunio down is the cause of his strained relationship with his father Kōnosuke.

Localized versions

In Crash 'n the Boys: Street Challenge, Mamoru was renamed Theodore "Todd" Thornley IV. In this version of the game, he is made a playable character and acts as the captain of the Washington High School team. Washington High was Hanazono High School in the original game, so Todd replaces Riki.